<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  
</head>
<body>
  <div id="app">
    <button @click="createMsg">动态创建一个数据</button>
    <div v-if="isShow">
      <button @click="changeMsg">修改这个属性</button>
      {{msg}}
    </div>
  </div>
  <script src="./vue.global.js"></script>
  <script>
    const { createApp } = Vue;
    const  app = createApp({
      data(){
        return {
          isShow: false
        }
      },
      methods: {
        createMsg() {
          this.msg = '这是动态创建的';
          this.isShow = true;
        },
        changeMsg(){
          this.msg = '值改变了'
          // this.$forceUpdate();
          // this.$set(this, 'msg', '值改变了')
        }
      },
    })

    app.mount('#app')
  </script>
</body>
</html>